Road paver



sept. 24, 1940.

-RoAD PAVER Filed Dec. 15, 1956 7 Sheets-Sheet l Sept. 24, 1940.

c. G; ABERNATHY ET AL ROADIPAVER Filed Dec. l5, 1936 7 Sheets-Sheetsept. 24, 1940.

c. G. ABERNATHY ET Al.

ROAD PAVER Filed Dec. l5, 1956 '7 Sheets-Sheet 3 c. G. ABERNATHY ET Ai.2,215,455

ROAD PAVER Filed Dec. 15, 19:56 7 sheetsusheet 4 Sept. 24,

.wNNA mm Sept; 24, 1940. c. G. ABERNATHY x-:rAEALv ROAD PAVER 7Sheets-Sheet 5 Filed Dec. l5. 1936 SWK INVEN-roR MCX ATTQRNEYSW Sept.24, 1940.

c. G. ABERNATHY. gtr AL 2,215,455

ROAD PAVER 7 Sheets-Sheet Filed Dec. l5, 1936 Sept. 24, 1940. c. G.ABERNATHY ET Al.

ROAD PAVER Filed Deo. 15, 195s 7 sheets-sheet 7 V Il a-wl y TTORNEYSOHINVENTOR Patented Sept. 24, 1940 PATENT :OFFICE RGAD PAVER y Clyde G.Abernathy, nomen, and Axel E.

Lundbye, Nunda, N.

Application December 15, 1936, Serial No.' 115,976

18 Claims.

This invention relates to a road paver and.

more particularly to amachine for laying and grading stone and asphaltmixes upongroadways and resurfacing the same or in providing an originalsurface or base for the road. The machine can be used for laying andgrading either cold mixes or stone, asphalt and solvent for the asphaltor hot mixes of asphalt and aggregate. In laying and grading asphalt andstonemiatel" rials on a roadway considerable dimculty has beenencountered by reason of the'fact that the stone and asphalt mix isextremely heavy and diiiicult to handle and lay to an accurate surface.

It is theprincipal objectofthis invention to l5 provide a machine whichlays and grades heavy mixes of asphalt and stone, or the like; whichwill handle large quantities of such mixes and rapidly and accuratelygrade the same to provide' the smooth and uniform surface desired; andwhich accomplishes this without'requiring any handling of the mix, themix being dumped directly into the hopper of the machine from thetrucksused for transporting the mix to the Job.

the paver shown and described in the Clyde G. Abernathy Patent No.1,994,082, .dated March 12, i935, and also shown in the copendingapplica,- tion of Clyde G. Abernathy, Ser. No. 744,933, led April 21,1934. In the paver forming the subject of both the present applicationand the said Abernathy patent and application the paver consistsgenerally of a frame having'iront steering wheels which ride along thesurface to be paved, rear rollers or wheels which ride upon the surfacelaid by the machine. a hopper disposed at the center of the carriagebetweenthe front and rear 4wheels and a horizontally reciprocatingtoothed cutter bar which cuts oil the column of paving material beingdischarged from the hopper. This cutter bar is located below the hopperand therefore it grades the road along a line determined by thedifferential in height between the `front and rear wheels of the paverso that a substantially smooth pavement is laid even though the frontwheels are riding over an extremely rough and irregular subgrade. Thesmoothness of the finished roadway is further increased .by theusual'practice of laying the roadway in two layers, the iinishing of thefinal layer by the machine providing a specially smooth and uni- Y formroadway. With such a paver all necessity for the use of forms and thelike is eliminated. `In addition to the objects set forth inthe said 55/Abernathy patent and application, the present The presentinvention is animprovement on` Y replaced to its initial application is directed toimprovements:

A further object of the present invention is to provide a simple andconvenient means for independently adjusting each of the front steerfing wheels vertically relative to the carriage and hopper carriedthereby. By this means a rough adjustment: of the thickness of thelayerkbeing laid can be obtained and also the height of the two wheelscan be independently adjusted to meet different conditions encounteredon a roadway, such as a highly crowned subgrade on which it is desiredto lay a slightly crowned surface, it being understood that the roadwaysare generally laid in parallel strips.

Another object of the present invention is to provide -a simple andconvenient means for adjusting the curvature of the reciprocating cutterbar from the operators platform to obtain any desired crown of the road.y

Another purpose oi the present invention is to provide a quick lift forthe cutter bar which permits the cutter bar to be quickly released andelevated'and as quickly returned to its initial position. It frequentlyhappens in paving a road that an intersecting paved road is encountered.'I'he quick lift for the cutter vbar permits of quickly lifting thecutter bar after which the paver can be transported to the other side ofthe intersecting road; the cutter bar position and the paving continued.It will -also be understood that this quick release permits of quicklyelevating the reciprocating cutter bar if an obstruction should beencountered. 35 Another aim of the present invention isl to provide asimple and eiective means for heating the reciprocating cutter bar, suchheating insuring the smooth operation of the cutter bar in cuttingthrough the column oi' hot mix and also in perfecting its action inironing the surface of the roadway being laid. y'Ihe heat. for thispurpose -is preferably derived from the exhaust gases of the gas enginewhich is used for driving the paver and reciprocating the cutter bar,but 45 it will also be understood that the hot water developed in thecooling system oi' the gas engine might also be employed and also thatthe heat might be applied from a separate heating device such as a torchor the like. l

Anotherpurpose of the present invention is to provide an indicator inthe form of a bubble level which'indicates the tilt or list oi' thepaver carriage. 'I'he purpose of such a bubble level i's' tofacilitatethe laying of a crowned roadway 5s the following separate in aplurality of parallel strips. Thus, in laying a strip along one side ofa crowned roadway the front wheels are set to maintain the desired listand the bubble indicator is set so that its bubble is centered at thislist. Any departure from this desired list, of course, immediately showson the bubble indicator and the proper adjustment to compensate can bemade.

Another object of the present invention is' to provide a simple andeffective means for applying lubricant to the rear rollers so that thereis no danger of any of the freshly laid roadway sticking to the rollers.l

vAnother purpose of the present invention is to provide a dolly whichcan be used to support either end of the cutter bar. 'Ihis dolly isprovided with a pair of rollers which are extended to ride upon a stripoi' paving material already laid and which serve as a gage with the'corresponding end of the cutter bar, thereby to insure a smooth anduniform joint between the two strips. It will further be seen that bythe use of such a dolly, plus the level indicator, the gaging of thestrip of roadway being laid can be gaged exclusively 'from the strip ofpavement already laid and on the edge of which the dolly rides, sinceany departure from the proper list of the paver in laying the secondstrip will be immediately detected on the bubble level. y

Another object of the invention is to provide a paver having a simplemeans for blocking of! any desired portion of the hopper so that thepaver will lay a strip of less than the maximum width, this blocking offmeans being quickly inserted in the hopper and also quickly removed.Another object of the invention is to provide a paver having avertically adjustable reciprocating cutter bar which determines thegrade 'and which is spring supported to permit it to yield slightly in avertical direction on encountering large obstacles and in which a gageis,

provided which is connected to the cutter bar adjusting mechanism abovethe spring support so that such` minor accidental fluctuations in theelevation of the cutter bar which are compensated by the springs do notregister on the gage. Another object of the invention is to provide asimple and eiifective means of adjusting the `height of the cutter barand which includemeans for adjusting the tension of the above springsupport for the same as set forth above., Another object of the presentinvention is to provide a simple and convenient means for providing anydesired crown in the cutter bar so that thev surface laici has thedesired crown.V

s time the crown to which the cutter bar is set to provide. v

- Another purpose is to provide means operable from the same hand wheelwhich adjusts the crown of the cutter bar for adjusting the crown of thegroup of tampers which followthe cutter bar, thereby providing -a singleadjustment for the crown of the cutter bar and the tampers and avoidingirregular tamping.

Another purposeof the present invention is to provide a simple andefficient scariiler for roughening the paved surface laid by the paverpreparatory to its being subsequently rolled.

Other objects of the present invention .will appear from the followingdetailed description.

In the accompanying drawings the paver is 5 shown after having beenstripped of a number of details forming no part of the presentinvention, reference being made to the said Aber-A nathy Patent No.1,994,082 for a complete showing of such details.

Fig. 1 is a top plan view of the paver embodying our invention.

Fig. 2 is a ,fragmentary vertical longitudinal section, taken on line 22, Fig. 1 and showing the level indicator. 15

Fig. 3 is a front elevation, looking forwardly of the level indicatorshown in Fig. 2.

Fig. 4 is a side elevation of the paver.

Fig. 5 is a fragmentary view, similar to Fig. 4, and showing the cutterbar supported at one 20 end by a dolly which in turn is supported on theedge of a strip of pavement already laid.

Fig. 6 isa vertical fragmentary section, taken on line i-I, Fig. 5.

Fig. is a rear elevation of the paver.

Fig. 8 is a fragmentary vertical fore and aft section taken on line 8 8,Fig. 'I and showing the roller mounting for the sub-carriage whichcarries the scarifler.

Fig. 9 is a vertical fragmentary fore and aft 30 section taken on line9-9 of Fig. 7 and showing a part of the drive mechanism forreciprocating the scariiier subcarriage.

Fig. 10 is a horizontal fragmentary sectiontaken on line Iii-I0; Fig. '1and looking down- 35 wardly upon the scariiier.-

Fig. 11 is a vertical fragmentary section on an enlarged scale throughthe adjustable pintle which supports each fr ont wheel for steeringmovement, this view showing the means for adjusting each steering wheelvertically.

Fig. 12 is a horizontal section taken on line |2-|2, Fig. 11.

, Fig. 13 is a vertical fragmentary fore and aft section taken on line|3-I3, Fig. 1, and show- 45 ing the quick-lift device for quicklyelevating the cutter bar out of operative positioh and returning it tothe same position.

Fig. 14 is a vertical fragmentary section taken on line I4M, Fig. 13.

Fig. 15 is a'transverse section through the road paver showing the meansfor adjusting the f curvature of the reciprocating cutter bar by asingle adjusting wheel located on the platform.

Fig. 16 is a transverse section through the 55 paver taken somewhat tothe rear of the section forming Fig. 15 and showing the tampers whichtamp the roadway after having been graded by the cutter bar. f I

Fig. 17 is an enlarged fore and aft section 60 takengenerally along lineI'l-|'|, Fig. 16 and showing the manner in which the tampers arereciprocated and also showing the manner in" which the curvature of theline of tampers is adjusted to conform to the curvature to which .65 thecutter bar was adjusted.

Figs. 1 8 and 19 are diagrammatic views showing the manner in which thecams which adstraight.

Fig. 20 is a view similar to Fig. 19 showing 75 2liA broken away,'andshowing a modied form of the means for adjusting the curvature of thecutter bar and also the curvature of the tam-pers.

Fig. 23 is a fragmentary enlarged view of the adjusting means shown inFig. 22.

Fig. 24is afragmentary vertical fore and aft section taken on line 2424,Fig. 22.

Fig. 25 is a vertical section, taken along line 25-25, Fig. 22.

Fig. 26 isl a vertical fore and aft fragmentary section through theroller which contacts with and oils the main roller of the paver, thissection being taken on line 28'28, Fig. 7.

Fig. 27 .is a vertical transverse section, taken.

' on line 21`-21, Fig. 26..

cross beam 32 connects the rear ends o1" all of l,

the side beams 38 and 3| and the cross beam 33 is arranged adjacent thecenter of the carriage and cross connects the inner channels 3|.

The rear end of the carriage or frame is supported by a pair of rollers34 and 35 which are arranged toride upon the surface freshly laid by themachine and each roller is independently supported at its opposite endsin yielding bear` ings provided at the lower ends of brackets 38 whichproject downwardly from the frame of the carriage, the bearingspermitting they 'rollers to adapt themselves to the crown of the road.The front end of the machine is supported by a pair of steering wheels31 and 38 which are adapted to ride upon the subgrade or surface whichis to be paved. y

Between the front steering wheels and the rear rollers is disposed. ahopper 40 having side walls 4l and 42, a rear Wall 43 which ispreferably vertically disposed and a front wall 44 which is disposed atan angle, the front. end thereof being comparatively low and beingsupported by an angle bar 45. The rear end of this front wall 44 issupported by an angle barA 46 and terminates is an elongated opening 41which extends the full width of the hopper between the rear end of thefront wall 44 and the bottom of the rear wall 43. Through this opening41 the material is discharged onto the subgrade being surfaced. e

The paver is propelled by a gas engine 58Vwhich is mounted upon theoperators platform 48. This gas engine. drives, throughgearing-containe'dinl a gear boxA 5|, a transmission contained in atransmission housing '52. The transmission contained in the housing 52drives a-chain 54 (Fig. 7) -which chain in turn drives a sprocket 55 ona countershaft 58.- This countershaft has fixed thereto a pair ofsprockets which drive chains 51, these chains driving sprockets fast tothe separate axles 58, 58, one axle being provided for each roller 34and 35. The independent axles of the two rollers 34 and 35 are shown asbeing mounted at each end in bearing blocks sa eachof which is slidinglymounted in vertical slideways provided in each bracket 36 suilicientlyloosely to permit tilting of the axles 58, 58 and thereby permit therollers 34, 35 to independently adapt themselves to the crown of theroad. Each bearing block 88 is supported by acompression spring 89, thepressure of each spring being independently adjustable in any suitablemanner as by the adjusting screw shown in Fig. 7. While each axle 58 isshown as being sup;- ported ateach end in the spring backed beartheinner or adjacent ends of the axles 58, 58 to permit the inner ends ofthe rollers 34, 35 to move upwardly or downwardly and adapt themselvesto the crown of the road being laid.

It will be understood that the transmission contained 'within' thehousing 52 is under suitable manual control so that the gas engine canbe connected to propel `the paver or be disconnected therefrom at will.Such control levers are completely illustrated in the said Abernathyapplication Ser. No. 744,933, but inasmuch as this control forms no partof the present invention it is notillustrated inthe present application.

y The gas. engine 50 also rotates a rakerbar 59 as the paver travels,this raker bar 59 serving to mix the material in the hopper 48 andinsure its free passage through the slot 41 in the bottom of thehopperand also serves to spread the ymaterial uniformly along the hopper,thema,- `terials being dumped into the hopper directly from the truck. Forlthis purpose the `raker bar includes a shaft whichis square in crosssection at its center and its ends are journaled in bearings at the sidewalls 4I and 42 of the hopper. Aplurality of L-shaped blades 8| aremounted on the square faces of the raker bar shaft, -these blades beingcapable of adjustment as to angularity so' as to vary theirspreadingaction in accordance with the particular material being. handled, asmore fully set forth in the said Abervnathy application. lThe drive forthe raker bar includes a. pinion 82 mounted on the transverse driveshaft 53 which is driven by-the gas engine, as previously described.This pinion 82 meshes with a gear 83 which is fast to a iackshaft 84,this Jack shaft being Journaled in a suitable bracket 85 carried by themain frame. This jack shaft also carries` a sprocket which drives achain 88,`this chain driving a sprocket 81 fast to the raker bar shaft80.`

Each oi' the front steering wheels 31 andv 38 is adjustable as to heightindependently of the other. For this purpose the ends of each pair ofside channels 38 and 3| are welded to a steering bearing 10 whichcarries the steering spindle I 1I. This spindle is iixedly secured to asteering knuckle 12 in any suitable manner and the lower end of thisknucklev carries thel stub axle 13 of the corresponding steering wheel31' or 38. A steering arm 14 projects laterally outward from eachsteering knuckle and is connected to a drag e link 15. 'I'he other endof each of these drag. links 15'is connected to an arm 18 the two arms'18 being fast to a cross shaft 11, this cross shaft being suitablyjournaled inthe main frame and extending underneath the lower wail 44 ofthe hopper. lOn this shaft is mounted a worm wheel 18 which is drivenby' a worm 19 on the steering shaft 80. The steering shaft 80 extends upto the drivers' platform 48 and is driven by the usual steering wheel8l.

. ing block 58, such blocks are only essential at providing thisadjustment is to provide a roughA adjustment for the thickness of thelayer deposited through the hopper and also to permit of adjusting theentire carriage to any desired angularity or list as conditions mayrequire Thus, if it is desired to resurface a highly crowned road with apavement having a smaller crown and it is necessary to build up theroadway in parallel strips the front wheel nearest the curb is adjustedso that that side of the carriage is elevated relative to the side ofthe carriage nearest to the center of the road. By this means it will lbe seen that more material can be layed to the curb by raising the frontwheel on one side.

'I'he hopper 40 is not, of course, of sumcient size to take an entireload from the trucks which transport the material to the job.- In orderto facilitate the discharge of the material from the truck into thepaver the truck is backed up bel tween the front wheels of the paver anduntil its rear wheels engage rollers 84 mounted on the angle bars 45 ofthe hopper. As the paver moves along the Ypaver pushes the truckforward, the truck gradually emptying the mix into the hopper. The truckwheels, of course, rotate as the truck is pushed along and as therollers 84 will rotate with the truck wheels it will be seen that theserollers provide a rolling drive between the paver and the truck. Whenthe truck has been completely discharged, it is driven away and an'-other truck brought 4up against the rollers 04. This provides anextremely simple means for handling the problem of keeping material inthe hopper. 4

The hopper 40 is provided with a power cutoff or closure which closesthe slot 4 1 in the bottom of the hopper when desired. The purpose ofsuch a power cutoff is to permit of transporting the paver over areaswhich are not to kbe paved. Thus, if an intersecting paved road -hopperand is slidably mounted under the lower wall 44 so as to be movableunder the discharge slot 41 of the hopper and close this slot. Thesupport for this plate can be of any suitable form. To this closureplate B1 is secured a rack 88 which is driven by a gear 80. This gear ismounted on a shaftwhich is drivenby a bevel gear 80, this bevel gearbeing driven by a pinion 9| on an angular shaft 92.v This shaft isdriven by a manually operable clutch (not shown) for Athe jack shaft. Itwill also be seen that this power cutoff can be used to clear the pathfor the paver under certain conditions. Thus.'

if the supplying truck should accidentally drop A a large mass of thepaving material on the road to be leveled oil.' by hand to prevent thefrom becoming stuck. However, it will be seen that the provision of thepower cuto avoids the necessity of so doiiig since the operator can movethe hopper up to the'obstructing mass and then `close and open the powercutoff, the plate 81 operating as a leveler and cutting down theobstructing mass on the advance of the paver to permit the hopper topass thereover.

It is frequently desirable to lay a strip of pavement less than the fullwidth of the hopper. To do this it is necessary to block off a portionoi' 'the hopper. The means for so blocking c' portions of the hopperinclude a series of narrow plates 93 having holes at their oppositeends, the'se plates fitting over a series of pins 94 provided in thebottom of the hopper along the discharge slot 41. These series of pinsextend inwardly from opposite sides of the hopper to a point vproviding`the narrowest strip which would be desirable to lay, no pins beingnecessary for a substantial distance from opposite sides of the centerof the hopper. The innermost of the plate or plates 93 preferably hasattached thereto an edger plate 95 which extends forwardly under tosecure or `mold a square shoulder at the edge' of the strip being laid.The material being discharged from the hopper is cut to an accurategrade by a toothed cutter bar |00, the teeth of which project forwardlyunder the opening 41 of the hopper so that the cutter bar cuts into thecolumn of material being deposited from the hopper. This cutter bar isreciprocated; the opposite ends thereof are independently adjustable asto height so as to be adjustable to meet any conditions encountered; itis capable of -being curved to provide any desired crown in 4the surfacefinished by it; is provided with a quick release so that it can be'quickly elevated and replaced toits original ing paved road; and isalso heated so as to facilitate its cutting through the mix and also toprovide an ironing action.

The cutter bar includes a channel |I, as best shown in Figs. 13 and 14,which is not only set hat but also is provided with a series of slots inits flanges, as best shown in Fig. l5, s0 that it can be exedvertically. To the bottom of this channel are welded a pair of strips|02,

and to the bottom of these strips are secured, in any suitable manner, aseries of cutting plates |03 which project forwardly and have theirfront` ends pointed so as to form the teeth of the cutter bar. Theseplates are, of course, rendered removable so that they can be replacedas they wear and these teeth project forwardly under the rear wall 43 ofthe hopper so as to cut into the column of material being dischargedfrom the hopper. l

The cutter bar structure which is described is reciprocated along atrack |04, the curvature of which can be adjusted. The connectionbetween the cutter bar and the track |04 includes a plurality of`bearing brackets |05 which, as best shown in Figs. 13-15, are rigidlysecured at spaced intervals to the upper face of the channel 0| and eachof which carries a pair of rollers |06 and |01 which engage the upperand lower sides,

^ respectively. of the track |04. The cutter bar is reciprocated in anysuitable' manner. as by a link |08 which can be reclprocated by the gasengine 50 in any suitable'manner, such as is shown in the said Abernathypatent. The teeth of the cutter b'ar structure extend completely to theend of the channel I 0I and are projected beyond the sides of the hopperas the cutter bar is reciprocated By this means, in laying a strip ofpaving material against a strip which has alby a link IH which links arepivotally connected to the front lower corners of the side plates 4I and42 of the hopper. These links take the rearward thrust of the `cutterbar in moving forwardly and cutting off the column of material beingdischarged by the hopper. To permit of independently raising or loweringeither end of the cutter bar assembly an angular bracket H2 is securedto each end of the anglebar I I0 and the adjusting mechanism is securedto this angular bracket H2. Each adjusting mechanism includes a bracketI| 3, the two brackets being connected to the carriage or frame of thepaver by a common quick-lift device indicated generally at H4. Thequick-lift device includes a cross shaft I I5 which is suitablyjournaled in brackets H6 on the cross channel 33 and at each end has acrank lever I I1, the crank pin of which is in the form of a cap screwH8 which connects the free end of the crank lever with the correspondingbracket H3, as best shown in Figs. 13 and 14.

. A segmental ratchet wheel I I9 is fast to the cross shaft I I5 and isengaged by the tooth |20 of a detent |2|. This detent 2| is pivoted,.asat |22, to one of the brackets I I6 and is normally pressed upwardly andinto engagement with the. ratchet wheel H9 by 'a small compressionspring |23. The free end of the detent |2| is extended to form a foodtreadle |24.

Another bracket |26 is secured to the cross beam 33 adjacent the ratchetwheel H9 and carries a swinging hand lever |26. This hand lever carriesa pivoted pawl |21, the free end of which is formed to provide a toothwhich engages the teeth of the ratchet wheel I I9 and the other end ofwhich is connected to a rod I28.which is lifted against the resistanceof a spring |29 by a small L-shaped lever |30 pivoted to the upper endof the hand lever |26 adjacent the grip of the hand lever |26. Thespring |29 normally holds the pawl |21 out of engagement with teeth ofthe ratchet wheel I9 and when both the hand lever |26 and the smalllever |30 are gripped so as to move the small lever |30 toward the gripof the hand lever |26 the 'rod |28 is elevated so as to throw the toothof the pawl |21 into engagement with the teeth of the ratchet wheel H9.

The majority of the -teeth of the ratchet wheel H9 are of regularratchet form but these teeth terminate in a special .locking recess'|3I. This locking recess has parallel sides-extending substantially ina radial direction and the tooth |20 of the detent |2| is similarlyshaped to have parallel sides and exactly fit the .recess I3I.Therefore, when the tooth |20 is engaged in the recess ISI the ratchetwheel is locked against rotation in either direction. In order,therefore, tolft thc cutter bar from its, say, operative position by thequick release device it is first necessary for the operator to step onthe treadle |24v so as to withdraw the tooth |20 from the locking recessI3I. Upon then gripping both the grip of the lever |26 and thesmallL-shaped lever |30 the small lever |30 is moved so as to depressthe rod |28 against the resistance of the spring |29 and throw the dogo-r pawl |21 into engagement with the teeth of the ratchet wheel H9.Upon then swinging the hand lever |26 rearwardly the ratchet wheel H9 isrotated and the operator thereupon releases the foot treadle. |24

.so that the spring |23 moves-the detent I2| so lthat its tooth engagesone of the ratchet teeth of the ratchet wheel H9. It will be seen thatin the continued elevation of the cutter bar assembly the detent |2|acts in the manner of an ordi- I nary detent and that by reciprocatingthe hand lever |26 and pressing upon the small L-shaped lever |30 oneach backward stroke and releasing it on the forward stroke the ratchetwheel is turned and held in any turned position. The turning'of theratchet wheel o-f course rotates thecross shaft H5 and its crank arms H1elevate'the brackets 3 thereby lifting the angle bar III and thel trackand cutter bar assembly carriedthereby. It will be seen that byreversing the operation of the pawl and detent |21, I2 I, the cutter barassembly can be lowered to any desired position.

In-order to prevent accidental operation of the quick release throughthe operator inadvertently stepping on the treadle |24,.a locking deviceis "provided which, as best shown in Fig. 13, consists of a. slidingplate |32 slidingly securedto the main frame by bolts |33 and carrying ascrew |34. The plate is so arranged that when the quick-lift is raisedthe operator can kick the plate |32 under the treadle |24, the screw |34then preventing the treadle from being accidentally depressed.v Thescrew, of course, provides an adjustable stop.

Each of .the brackets H3 carries an adjusting mechanism by which 4thecorresponding end of the cutter bar assembly can be adjusted verticallyrelatively to the carriage. For this purpose the bracket is povided withan upper arm |35, an intermediate arm |36 and a lower arm |31, as bestshown in Fig. 14. In the upper arm is threaded a vertical screw shaft|38 which is turned by a hand wheel, |39. The lower end of the screwshaft |38 is rotatably secured to a vertically movable slide block |40'so that upon turning the hand wheel |39 this block is elevated ordepressed. This block is guided in the bracket I I3 and preferablysuitable graduations, as indil cated in Fig. 4, are provided toindicatethe relative position between the bracket H3 and the block |40. To thesliding block |40 is also connected a vertical rod- I4I upon which thecorresponding end of the cutter b'ar assembly is hung.

This rod is preferably screwed into the block |40 and held in positionby a lock nut and its lower end extends through the top of thel bracket.I I2. A head |42 is provided at the lower end of this l'rod I4I and arelatively small compression spring |43 is interposed'between this headand the underside of the bracket H2. A sleeve |44 surrounds theintermediate part of the hanger rod |4| and is guided by theintermediate and lower arms |36, |31 of the bracket H3. A rotatable handwheel |45 is mounted on-the upper `threaded end ofthe hanger rod |4| andis adapted to engage the upper end of the sleeve |44.

The lower endof this sleeve bears against a coling direction. Thiselevates or depresses the corresponding end of the angle bar ||0 andconsequently -elevates the track and cutter bar supported thereby. 'Ihepurpose o the opposing springs |43 and |41 is to permit the cutter barassembly to yield slightly in its operation of cutting through thecolumn of asphalt being dis- .charged by the hopper. In order to balancethe action of these springs, after the desired adjustment of the heightof each end of the cutter bar has been obtained through. the hand wheel|36, the hand wheel |45 is turned to relieveor increase the pressureexerted by the spring |41 downwardly upon the cutter bar assembly. Theupper spring |41 is preferably heavier than the lower spring |43 tobetter resist the tendency of the cutter bar assembly to lift because ofits compressing action caused by the inclined cutting edges of itsteeth.

In surfacing a highway the pavement is laid in several strips and whereone striphas been accurately laid it is desirable to'be able to gage theheight of the contiguous strip from the edge of the strip already laidso that the two strips` form smooth continuations of one another and thejoining of the ,two strips is effected without a seam. Also in layingthe original. strip it may be desirable or required that a forni be usedto pave from, such forms being in the nature of temporary railsaccurately placed and leveled at the sides oi the highway. Ordinarilytwo such forms are used, the present invention permitting of using oneas a level gage surface. To permit of gaging the height of a strip beinglaid from the surface at the edge of a contiguous strip or from a singleform ,the dolly shown in Figs. 5 and 6 is employed. This dolly is in theform of a bracket |50 carrying a pair of small rollers |5| which areadapted to ride upon the surface, near the edge, of a strip of pavementalready laid or upon the form. The bracket |50 is provided with a pairof spaced vertical slots |52 and the dolly is secured by a pair of bolts|53 to a small angle bracket |54, this bracket in turn being secured toa small angle piece |55 welded on the rear, face of the angle bar ||0.'I'he bolts |53 extend through the slots |52 so that the position of thedolly relative to the angle bar |I0 and hence the cutter bar assemblycan be adjusted.

Cooperating in use with the dolly is a leveling device, illustrated indetail in Figs. 2 and 3, and consisting of a swinging bracket |56 whichis pivoted to the main frame of the paver to` swing about an axisparallel with its line of movement on a.pivot bolt |51. The levelingbracket |56 is preferably pivoted to the frame at a point withinconvenientreach and observation vfrom the operators platform 48, such asthe top rail of the rear wall 43 of the hopper 40, At its top thebracket |56 carries a bubble level |58 oi any usual and well known typeand at its bottom this bracket carries a scale |59 which traverses afixed indexing pointer |60. The bracket |55 is provided at its lower endwith an arcuate slot through which a stud projects which carries a wingnllt I6I. It will be seen that by loosening the wing nut |6| the bubblelevel |56 can be swung to any position relative to the hopper and upontightening the wing nut |6| this relation can be maintained. Since thebubble level |56 extends transversely of the paver it will be seen thatthe bubble level will indicate any list of the machine and it willfurther be seen that by the adjustment of the bracket |56 the paver canbe set to have any desired list, and this list maintained by watchingthe bubble in the bubble level and adjusting the elevation of one end ofthe cutter bar to maintain this list.

Assuming that one strip of pavement or a single form has beenVaccurately laid and lt is desired to lay another strip against it, thedolly |50 is attached to the bracket |54 by means of the bolts |53.- Theheight of the cutter bar is adjusted so that the teeth |03 engage theupper surface of the strip already laid and the bolts |53 are thentightened so that the dolly malntains this position of the cutter bar asthe paver moves along. Ihe opposite side of the cutter bar assembly isthen adjusted, through the medium of the opposite hand wheel |36, toobtain the desired thickness of pavement on the oppoposite sideof thestrip being laid. 'I'he level indicator shown in Figs. 1, 2 and 3 isthen ad- `iusted so that the bubble is in the center of the bubble level|58. The paving thereupon proceeds with one side oi the cutter bar gagedfrom the strip of pavement already laid or gaged from the form. If'thebubble ln the bubble indicator deviates from the center the operatoradjusts4 said other hand wheel |39 so as to elevate or drop the` freeedge of the strip being laid back to the height desired and hence bringthe bubble in the bubble level |58 back to the center. In this manner iswill be seen that extreme accuracy can be obtained not only in workingthe strips together at their edges to form a smooth continuation of oneanother, but also in accurately maintaining the level of the oppositeside o! the strip being laid.

In' order to provide a square shoulder at the opposite-side of the stripbeing laid an edger plate |62 is employed at the opposite side of thepaver. This edger plate is carried by a plate |63 which in turn isconnected by a pair of bolts |64 with the link that takes the thrust ofthe cutter bar assembly. The edger plate |62 is disposed under the teeth|03 of the cutter bar assembly, these teeth thereby travelling over thetop ofthe edger plate and in colse relation thereto so'that the materialbeing' discharged from the hopper is pressed against the edger plate bythe teeth as they reciprocate and a square shoulder molded in the edgeof the strip. It will be understood that when one strip is being laid anedger plate |62 will be provided at each side of the paver so that bothedges of the single strip will be provided with a square shoulder.

In order to heaty the teeth, oi the cutter bar and thereby facilitatetheir action in cutting through the column of asphalt and stone beingdischarged from the hopper and also to heat the material and provide asmooth ironed surface,'

the exhaust from the g-as engine 50 is conducted to the space |65 formedbetween the channel |0|, cutting plates |03 and spacer strips |02, theexhaust gases passing through this space and out through the open endsof this assembly. For this purpose an exhaust outlet |66 of the gasengine is connected to a ilexible conduit |61 which in turn, as bestshown in Figs. 4 and 15,

opening so that the exhaust gases can pass into the space or passage |65and thence out through the opposite open ends thereof. `By so employingthe exhaust gases from the gas engine it has been found that the plates|03 of the cutter bar are maintained at a high temperature and theircutting action is facilitated and' the material being discharged heatedso as to secure a more compact texture.

It will be understood that while we have shown the cutter bar as beingheated by the exhaust gases from the'motor which propels the paver,

this cutter bar could be heated by the hot water withdrawn from thecooling system of the motor or it could be heated by a separate heatingdevice, such as a separate oil heater, blow torch or the like (notshown).

The paver is required to lay surfaces having different crowns rangingfrom a zero curvature, such as would be employed on a banked turn in aroad, to a highly crowned road. To meet the diierentf requirements incrowning a road the track for the cutter bar is adjustable as tocurvature so that the cutter bar inreciprocating along this track willtake a corresponding curvature and crown the road accordingly. It is oneof the principal objects of this inventionV to provide a means foradjusting the curvature of the track by a single hand wheel or the likewhich is located on the operators platform so that the curvature can bequickly and conveniently adjusted` as conditions require, this beingparticularly important when the paver is merging a highly crowned roadinto a banked turn where no crowning is desired. To accomplish this thepreferred means, best illustrated in Figs. 15-20, include a hand wheel|10 which is located Within convenient reach of the operators platform48 andfast to a vertical shaft |1| which is journaled in a post |12. Thelower end of the shaft |1| is splined, as indicated at |13, Fig. 17,this splined end of theshaft fitting into a universal joint |14. Theother part of the universal joint |14 connects with a shaft |15 which issupported and journaled in a bearing provided on a bracket |16, thisbracket being carried .by the angle cross bar 0. On the lower end of theshaft |15 is fixed a bevelled pinion |11 which meshesnwith a bevel gear|18. This bevel gear is fast to a. cross shaft |19, which shaft isjournaled, at in tervals, in bearings |80 (see Figs. 15 and 17),-

these bearings being secured to the angle cross bar Il 0. At intervalseccentrics |8| are'mounted on the cross shaft |18 and each eccentric ishoused within an eccentric housing |82, each housing forming theequivalent of an` eccentric strap, so that as the eccentrics are turnedthe housings |82 are raised or lowered accordingly. Each eccentrichousing |82 is connected by means of a rod l| 83 with the track |04 ofthe cutter bar assembly so that asthe eccentric housings are moved upand down the track |04 is flexed accordingly. Preferably the upper endof each of the rods |83 is threaded into a boss |85 formed on the lowerside of each eccentric housing |82 and is located in place by 'a nut|85.

In the paver shown the eccentrics |8| l.are shown as being ve innumber'and spaced uni-` formly along the cutter bar assembly. Therelative positions of the eccentrics are illustrated in Figs. 18 and 19kin which three ofthe eccentrics are shown, comprising the onecentereccentric and the two eccentrics on the one side of the paver. Itwill be noted 'that the rods` |83 are of different lengths, the rodsofthe outermost eccentrics being the vshortest and the rodA of thecenter eccentric beingvthe longest. The eccentrics are of uniform shapeand when the track |04 is disposed on a straight line, as illustrated inFig. y19, the salient portions of the outermost eccentrics extendvertically downward, the salient portion of the center eccentricVextends horizontally and the intermediate eccentrics extend at an angleof'45. As the shaft is turned in the direction of the arrow, shown inFig. 19, the eccentrics gradually assume the position shown in -Fig. 18,in which the outermost eccentrics are disposed at a angle; the innermosteccentric is disposed at a 45 angle projecting upwardly and theintermediate eccentrics are horizontally disposed. In this position`ofthe eccentrics, as

shown in Fig. 18, the track |04 is curved to provide the maximum crown.In positions of the eccentric shaft intermediate that shown in Fig.

18 and that shown in Fig. 19, a lesser crown is,

of course, obtained and it will therefore be seen that by turning thehand wheel |10 any desiredcrown can be provided in the roadway beinglaid inasmuch as curving the track |04 compels the teeth of the cutterbar assembly to traverse a similar curve and hence crown the roadaccordingly.

The hand wheel |10 is preferably provided with graduations, as indicatedin Fig. 1, and a pointer |10a is stationarily mounted on the machine andis traversed by the graduations so that the crown which the cutter baris set to provide can instantly be seen by the operator.I

An alternative form of eccentrics is shown in Fig. 20, this view being adiagrammatic view similar to Fig. 19. Inthis form the eccentrics |8|aare not of uniformI throw, the center eccentric having a relativelygreat throw, the outermost eccentrics having the minimum throw and theintermediate eccentrics having anintermediete-throw. The exact throw ofthe intermediate eccentric can be made to provide any condition ofcrowning which is desired and the length of the rods |83 are alsoadjusted to obtain the desired movement of the track. With the variablethrow eccentric shown in Fig. 20 the salient portion of all of theeccentrics is directly downward when the track is in a straightline.

7Therefore upon turning the eccentric shaft in either direction thegreater throw of the center eccentric will draw the trackv |04 upfurther atl its center than the other eccentrics and sincethe outermosteccentrics have the smallest throw the track at its opposite ends willbe drawn up a relatively small amount. Therefore by turning theeccentric shaft the eccentrics |8|a will effect any desired crowning inthe road up, of course to the maximum throw of the eccentrics.

' After the roadway has been deposited and cut oi to the proper grade atamping mechanism on the paver tamps the roadway. This tamping mechanismis located immediately in rear of the cutter bar assembly and since thecutter bar assembly can be adjusted to provide any desired crown in theroadway the tamping mechanism is likewise` rendered adjustable andconsistsof a plurality of small tampers, the relation of which can beadjusted to have the same curvature as the cutter bar assembly. Tocarry-the tamping mechanism an angle bar |90 extends ,the full width ofthe paver immediately in rear of the angle bar ||0.which carries thecutter bar assembly. The angle bar springs, at its opposite ends. Asshown in F13. 4,

-eaciv of the -springs |9| is a compression spring and interposedbetween the top of the corresponding end of the angle bar |90 and avbracket |92 each of which is supported by a quick-lift device generallysimilar to the quick-lift device supporting the cutter bar assembly. Atie rod |93 limits the downward movement of each end of the angle bar|90 so that these tie rods limit the downward movement of each end ofthe angle bar |90 but each end of the angle bar |90 is free to riseagainst the resistance of the springs |9|.' Preferably, also, a nut |94is provided for adjusting the tension of the spring |9|, as best shown.in Fig. 4. The angle bar |90 carries, on itsupper side, a plurality ofspaced bearl ings |95 which support an adjusting shaft |96.

e so:

Vsus

This adjusting shaft is provided with a bevel gear |91 which is turnedbya bevel gear |96 carried by the lower part of -a universal |99. Theother part of the universal |99 is splined, as indicatedat 200 in Fig.17, to a vertical shaft 20| which is driven by a gear 202 meshing with agear V203 fast to theadjusting shaft |1|. The adjusting shaft is turnedto adjust the crown of the cutter bar assembly and it will be seen thatas this adjustment is effected a corresponding adjustment is made of theshaft |96 of the tamping mechanism. The shaftl |96 carries a series ofcams 205 which are provided in the same number and spaced in a similarmanner to the cams |8| of the cutter bar assembly. As with the cams ofthe cutter bar assembly the cams 205 operate in eccentric housings 206so -that as the cam shaft |96 is turned the cams l raise and lower thesehousings.

' ranged in the same manneras the cams |6| forl crowning the cutter barassembly, i. e., either as shown in Figs. 18 and 19, or as shown in Fig.2'0.

Therefore, as the cam shaft |96 is turned the cams increase or decreasethe crown of theA slotted flexible bar 209.

The tampers 2|6 are each carried by a pair of sliding rods 2|6 each ofwhich is connected with a head 2|1. A centering bushing 2|8V alsosurrounds each rod 2|6 and is preferably welded -to thelower web 2|. ofthe slotted angle bar 209.

A compression spring 2|! is interposed between each of the bushings 2|6.and the underside of the corresponding head 2|1. Eachv head 2|1 isprovided with a pair of upwardly extending ears 220 and between theseears a roller 22| is mounted in any suitable manner.l Each roller 22|engages the face of a star-shaped' cam wheel 222. 'I 'he projectionsofthe star-shaped cam wheel are rounded so that as the star-shaped camwheels 222 are turnedthe rods 2|6 are caused to reciprocate by reasonofthe engagement of the rollers 22 with the star-shaped cam wheels, thesprings 2 I 9 acting in opposition to the salient portions of thestar-shaped cam wheels to elevate the tampers.l The star-shaped.cam-.wheels 222 are pro-l vided in pairs, one pair being provided foreach tamper 2li.

| is mounted onthe hand wheel |16.

- Each pair of star cam wheels 222 is oonnectedby an integral sleeve 223and each of the sleeves 223 is journaled in a bearing 224, the bearings224 being secured to the slotted vertical web 2|| of the angle b ar 209,as best shown in Figs. 17 and 21. Each pair of connected star wheels isprovided at one end with a pair of lugs 225 which are adapted to t in apair of recesses 226 in the opposing end of the next succeeding pair ofstar wheels. Accordingly, the star wheels are connected to rotate inunison. In order to maintain the several star wheels in proper axialrelation a rod 221 extends axially f through the center of all the starwheels, this rod being non-rotating and being connected at its ends tobrackets at the ends of the angle bar |90, as best shown in Figs. 4 andv16. Power for turningthe several star wheels can be applied in anysuitable manner from the gas engine 50. The several rollers 22| are alsopreferably continuously lubricated from a small cup 228 mounted on theupper side of each of the heads 2|1 and containing a bath of oil inwhich the several rollers 22| rotate. Means are also preferably providedfor applying lubricant to each of the tampers 2|5 so that in addition totamping the roadway they also apply a small amount of lubricant duringthis operation and serve to prevent sticking of any of the roadwaymaterial to the tampers. For this purpose a plurality of lubricantsupply lines 230 connect with a common'lubricant supply (not shown) andeach of the lubricant supply lines 230 extend through the verticalslotted wall 2 l2 of the ilexibie angle 209 and screws into the lowerpart of the corresponding bushing 2 |8. A passage 23| connects thelubricant supply line with a passage 232 provided in each of the rods 2|6. The bottom plate 234 of each of the tampers 2|5 is provided with aplurality of'openings 235 extending vertically therethrough, as bestshown in Fig. 21, andthe lubricant supply passages 232 in each rod 2|6discharge into the interior chamber 236 of each tamper 2|5 from which itpasses out through the ports or passages 235 in the bottom plate of eachtamper.

It is also desirable to provides quick-lift device at each end of thetamper assembly so that the opposite ends of the whole assembly can bequickly elevated in vthe same manner as the cutter bar assembly inpassing over an intercepting road or the like and can be as quicklyreturned tothe original adjusted position. To this end, each of thebrackets |92 is connected to the main frame .of the 'carriage by rivets236 passing through' lverticalslots 231 in the bracket'so that' thebracket is free to rise and fall. The quicklift -device supporting thetamper assembly is similar to the quick-lift device supporting thecutter bar assembly and the same reference numerals have therefore beenemployed' and distinguished by the sufilx a, the description of thecutter bar quick-lift applying to the tamper quicklift and hence notbeing repeated, the lower end of the rod |44a, corresponding to the rod|44 of the' cutter bar quick-lift being directly connected to ears 236on the brackets |92, as best illustrated in Fig. 16.

In the form of the invention shownuiny Figs.

1-21 the crown of both the cutter bar assembly and` thetamper assemblyis adjusted by turning In place of a single adjustment for the crown ofthese assemblies the crown of the same can be adjusted by the'modiiedform of mechanism shown in Fig.- 22. In this form no cams areemployedand the curvature of the track is adjusted by a plurality of rods .246which are which is splined as illustrated at 244 to a vertical connectedat intervals to the track |04 in any suitable manner. Each of these rods240 is threaded at its upper end and is connected to a rotatable nut 24I, these nuts being carried by the angle I |0 and each is turned by avertical adjusting shaft 242. Each adjusting shaft 242 is connected atits upper end to a universal 243 shaft 245. 'I'he shafts 245 extendupwardly to a point within convenient reach of the operator on hisplatform 48 and is suitably supported in bearings provided in a bracket248. The upper 'end'of each adjusting rod 245 is squared, as illustratedat 241 so that by applying a wrench the operator can turn any oftheshafts' 245 and thereby turn the corresponding nuts 24| to raise andlow'er the corresponding screw rods 240. be seen that by adjusting theseveral shafts 245 any desired crown can be obtained in the track |04and consequently the curvatureof the cutter bar assembly adjustedaccordingly. The cutter bar assembly reciprocates on the track |04 inthe same manner as in the preferred construction and therefore the samenumerals have been employed to designate similar parts.

In order to facilitate adjustment of the crown ofthe cutter bar andtamper assemblies, an indicator finger 248 is mounted in any suitablemanner on the upper end of each of the shafts 245, this indicator ngertraveling along an index scale 248 formed in the side of the bracket248, as best illustrated in Fig. 23. It will be seen that this scalereadily permits the operator to adjust each of the shafts 245 so as toobtain any desired crown in the road. l

Each of the shafts 245 carries a gear wheel 250 I which meshes with asimilar gear wheel 25|, this gear wheel 25| being fast to a shaft 252,as best illustrated in Fig. 24. The 1ower end of the shaft 252 issplined (as at 253, Fig. 22), to one part of a universal-254, thisuniversal driving a shaft 255 which is pinned to a nut 255. The nuts 255are exactly similar to the nuts 24| which adjust the curvature of thetrack |04 andl are threaded to rods 251 the lower ends of which aresuitably connected to the lower web of the. flexible angle bar 209. Thisangle bar 208 is the same as that shown in the preferred form of theinvention illustrated in Figs. 1-21 and carries an identical tampingmechanism. Therefore the adjustment of the crown of the cutter barassembly (by adjusting the curvature of the track |04) eifects a similaradjustment of the slotted angle bar 208 and consequently adjusts thecrown of the` tamper assembly.

In order to protect the rollers 34 and 35 which support the rear end ofthe paver against picking up pieces of the freshly laid roadway eachroller is preferably lubricated by alubricating device which ispreferably constructed as follows:

Above each roller 34 and 35 is mounted a small wooden roller 250. Eachof the rollers 250 is provided with bearings 25| at itsopposite endswhich turn on a lubricant supply pipe 282. The lubricant supply pipe isin turn mountedin alpair of links 253 each of which is pivoted at itsouter end to a bracket 254 on the main frame. of the wooden rollers 250is covered with felt 255 and each felt covered roller is held inengagement with the corresponding main roller of the paver by a spring28,5. which connects at one end with an arm 251 projecting upwardly froma cross bar 258, this cross'bar connecting the opposite links 253 foreach roller. The other end of the spring 255 connects vwith an adjustingsci-ew eye It will therefore Each 259 which `is adjusted by means of awing nut 210 which bears against any suitable part of the main frame.Each of the lubricant vpipes l252 is fed froma lubricant supply line 21|which is formed with a plurality of convolutions 212, as illustrated inFig. 1, to render it ilexible and permit free movement of the roller250. Each of these lubricant supply lines 21| connects to a commonllubricant supply tank 213, as illustrated in Figs. 1 and 4. Within theroller 250the lubricant pipe 252 is provided with a pair of dischargeorifices 214 at its center and these orifices discharge lubricant intothe center of the wooden' axial bore to a plurality of radial passages215.

By this means the felt covering 265 is kept constantly saturated withlubricant and from this covering the lubricant is transferred lto thesurface of the main roller 34 or 35, as the paver moves along. l

As a final operation of the paver it is frequently desirable to entirelyscarify thatportion of the strip laid over which the rollers havepassed. Thus, as the rollers 34 and 35 traverse the freshly laid stripthey roll two stripes in the strip. Unless the entire strip is rolledimmediately after the paver is passed these stripes may persistin thenished roadway and while the quality vof the roadway is not in any wayimpaired the stripes Each of the scarifying devices includes a bottomplate 280 to which are removably secured a plurality of scarifying.teeth 28| which project downwardly therefrom, as best illustrated inFigs. 7 and 10. This vertical vplate is connected at its opposite endsto vertical angle bars 282 which are suitably braced by diagonals 283.The back of each of the vertical angle bars 282 isnotched or serrated toprovide a plurality of rearwardly facing teeth 284 and these teethengage similar' forwardly facing teeth 285 provided in vertical hangerbars 285. The vertical bars 282 and 285 are secured together by throughbolts 281. The

upper end of each of the hanger bars 285 is conf angle bars 282 upwardlyor ldownwardly relative to the hanger bars 285, the depth of penetrationof the scarifying teeth can be adjusted as may be It will be seen thatdesired. The vpurpose of the hinge pivots 288 is to permit the scarierframe to be moved from the operative position shown by full lines shownin Figs. 4 and 7 to the inoperative position shown i by dotted lines inFig. 4. When the scarifier is in its operative position the rearwardthrust against the teeth in traveling along the roadway is preferablytaken by a flexible connecting member, such as the cable 290 shown inFig. 4, which connects the bottom plate 280 of the scarifier withbrackets 29| projecting downwardly from the main bearing brackets 35.The yscarifier in rear of each roller 34 and 35 is connected, as abovedescribed, to the movable angle bar 288. This anglebar`is provided atits opposite ends with a'pair of hangers 282, each of which hangerbrackets 282 carries a pair of opposing rollers 253 and 294. Each'roller253 rides on the lower flange 295 of the cross channel 92 which forms apart of the main frame of the paver and the other' roller 29d ridesalong the back of this channel 32. It will therefore be seen that theangie bar 2839 is ai compelled to travel along the channel 92. Thisangle bar 289 is reciprocated by means of a crank wheel 296 which isdriven in any suitable manner by the gas engine 50 and carries a crankpin 291 driving a link 293, the other end of which connects with abracket 299 which is secured to the angle bar 289 of the scarifyingapparatus. To guide the bracket 299m its movement a guide bracket 300 isfixed to the rear side of the frame channel 32 and embraces the crankwheel 290 and the bracket 299. It will therefore be seen that as whichthe rollers have not passed. The strip finl ished by the paver istherefore of uniform surface texture and in condition for nishing by theusual steam roller or the like.

Operation In the operation of the paver, assuming that a single strip isinitially to be laid the paver can be started by first laying a suicientamount of paving material of the desired height and thickness to receiveand support the rear rollers @f3 and 35 of the paver, the front orsteering wheels 51, of the paver riding alongthe surface which is to bepaved. The operator thereupon adjusts the hand wheels 39 so as to adjustthe height of the cutter bar at each side of the paver so as 4.0 tocontinue the probable elevation of the strip. Upon turning either handwheel HB9 to achieve this' adjustment the slide Mii (see Fig. 14) isadjusted vertically which elevates or depresses ,the hanger rod lil soas to raise or lower the corresponding end of the bar ||0 which carriesthe track |05 of the reciprocating cutter bar.

ThereafterY the tension'of the springs I9! (Fig.

4) which exert a downward pressure on the tamper assembly can beadjusted to secure the desired tamping action. Further, if the strip ofA material being laid is tol be much thicker at one side than at theother, the Ill-shaped washers 83 (see Fig. 11) which support either orboth front corners of the4 main frame: of the carriage on the frontsteering wheels 31 and 38 can be removed and the corner or cornerselevated to provide the desired list before the U-shaped washers 83 arereinserted. It will be understood that minor variations in the thicknessof the strip being laid can be obtained by adjustment of the hand wheels|39 of the cutter bar assembly.'`

The operator thenadjusts the level indicator (Fig. 3) so that the bubbleis in the center of the bubble level |58. The operator then brings thescariiier down to the operative position shown by full lines in Fig. 4and secures the tension cable 290 in position. The operator also appliesthe edger plates |62 to both sides of the paver by attaching each to thebars and adjusts these edger plates so that the teeth |09 of the cutterbar just clear the top of the edger plates, as best shown in Fig. 4.

The operator can then adjust the crown of the cutter bar assembly andalso the crown of the aardgas tamper assembly. To do this in the form ofthe invention shown in Figs. l2l, the operator urns the wheel am (Fig.15) which rotatestn am 'shaft' |19 (Fig. 17) which rotates the .c v v,8i so as to elevate or depress the dierent portions 5 of the track |021to provide the desired curvature thereof, the cams being set atdifferent angles (Fig. 18) or having a variable throw (Fig. 20) so as tosecure a uniform curvature of the track |04 in all positions ofadjustment. Since the 10 cutter bar travels along this track |04 it willbe seen that the cutter bar takes its curvature and hence grades thestrip being laid to have a similar crown.

Turning the shaft |1| from the wheel |10 (Fig. 15 l'lthrough the gears203 and 202 also turns the cam shaft |96 of the tamper mechanism andthese cams, which are formed and arranged similar tothe cams |8| of thecutter bar assembly, ad- 4 just the curvature of the slotted angle bar209 20 which carries the tampers 2I5. Therefore the, curvature of thetamper bar assembly will be adjusted to have the same curvature as thecutter bar assembly.

The operator thereupon applies power to the 26y shaft 92 so as tooperate the pinions 89 and, through the racks 88, draw the power closuregate 81 into its forward open position. The material in the hopper 40 isthen free to pass out through the opening 81 in the bottom, the effec-80 tive width. .of this opening being determined by the number of plates93 which are laid in the bottom of the hopper, this depending, ofcourse, upon the width of stripwhich is desired to be laid.

The truck of paving material is then backed up between the frontsteering wheels 31 and B of the paver until its rear wheels engage therollers 39 (Fig. 1). 'The operator of the truck thereupon elevates thebody so that an amount 4@ of paving material is deposited into thehopper 30. The operator thereupon applies power to the shaft 53 whichIrotates the shaft i and through the chain 61 drives the raker bar shaftB0 so as to start rotation of the raker bar 59 and spread 45 thematerial being dumped into the hopper uniformly over its entire width.Depending upon the consistency of the material to be laid the angularityof the blades carried by the raker bar shaft are adjusted to obtain thedesired spread- 50 ing action of the raker bar. The operator thenapplies power to the crank wheel (not shown) which reciprocates the link|08 (Fig. 15) this in turn reciprocating the cutter bar assembly alongthe track |04. The operator also applies power 55 to the star-shaped camwheels (Fig. 17) which in their rotation move the tampers 2|5 up anddown. The operator also applies power to the crank wheel 296 (Fig. 7)which reciprocates the traveling angle bar 289 which carries the scaria0fiersin back of the rollers 34 and 35. It will also be understood thatthe operator turns on the lubricant supply lines 21| and 230 (Figs. 26and 17, respectively) so as to supply lubricant to the wooden rollers260 (Fig. 26) which apply the o5 lubricant to the rear rollers 34 and 35and to the tampers 2|5 (Fig. 17).-

The operator thereupon applies power to the rear rollers 34 and 35 andcommences paving.

As the paver moves along, the material in the 70 hopper 60 drops throughthe slot 41 as a( column and the teeth |03 of the cutter bar cut intothis column and permit of the deposit of only enough material to form astrip which is graded and crowned by the cutter bar as it reciprocatesalong 75 its track |04. 'I'he reciprocation of the cutter bar works andsmooths the strip being laid and further forces the material up againstthe edger plates |62 so as to mold the sides of the strip to have cleansquare shoulders. Further, the exhaust from the .gas engine Il isconducted through the exible conduit |81 (Fig. 15) to the interiorpassage |65 of the cutter bar |00 (Fig.

17). This heats the cutter bar |00 so as to assist it in cutting throughthe column of material being discharged by the hopper and also to ironthe surface of the'strip being laid. y

' As the paver moves along, its front rollers 84 g i "V (Fig. l) pushthe truck along so that the depositing of the material into the hopperproceeds along with the movement of thepaver in depositing the layer ofpaving material.

The front wheels 31 and 88 of the paver ride l on the relatively 'roughsubgrade and, of course,

lthe front end of the .paver necessarily rises and drops in accordancewith irregularities inthe subgrade. However, the rise and drop of thefront end ofthe paver has a relatively small effect on the cutter bar|00 because this cutter bar is located near the rollers M and 35 whichride upon the strip of material being laid. Hence, even though thesubgrade is relatively rough the strip of material laid will bequitesmooth. Further, it is thepractice to lay the material in twolayers. Thus, after the roadway has been completely surfaced with therst layer the second layer is laid. It'will be seen that the secondlayer will be extremely smooth and free from irregularities even thoughthe subgrade was extremely rough because such irregularities would beonly slightly reproduced in the first layer of material and a almostcompletely eliminated when the second layer of material is laid over thefirst.

As the paver movesalong the operator watches the bubble level lss and 1rthis ivei indicates that the paver has taken an undesired list theoperator adjusts the corresponding hand wheel '|39 (Fig. 14) so as toelevate or depress the corresponding end of the cutter bar |00 so as tobring the strip back to the proper transverse angle and hence bring thepaver back to the desired lateral level in which position the bubble inthe bubble indicator |58 will assume a central position.

Also, if in paving, the operator approaches a curve in the-road hesimultaneouslyslacks off on the hand wheel |10 so as .to atten the crownof the cutter bar |00 and the series of tampers and also adjusts one orthe other of the hand i over this strip the stripes which are formed bythe rollers in the strip are eradicated by'the teeth 28| (Fig. 7) of thescariers which are reciprocated back and forth across the stripes by thecrank wheel 28,6.

When an4 intersecting road is encountered the operator applies power tothe shaft 82 (Fig. 4) so as to close the 'power cuto closure 81. Thisholds the material in the hopper 40 while the paver is driven across theassumed intersecting the entire cutter bar assembly and edger plates |82bythe quick-lift device shown in Figs. 13 and 14. lo operate eachquick-lift device the opera- 's tor kicks out the locking plates |32,steps upon the treadle |20 so as to release the tooth |20 from thelocking notch |3| and seizes the lever |28 together with the smalllgripping lever |30 and draws the two rearwardly. This causes the dog|21 to engage the teeth of the ratchet ||9 and rotate the ratchet wheel.He then steps off the treadle |24 which permits the tooth |20 to act asla holding dog in the continued reciprocation oi' the hand lever |26.'I'he turning of the ratchet wheel ||9 through this reciprocation of thehand wheel lever |28 turns the shaft ||5, thereby lifting the cranks I|1 and elevating both brackets ||3 which carry the adjusting mechanismvfor the opposite ends of the cutter bar assembly. Hence it will be seenthat the cutter bar is quickly lifted so as not to be injured intraversing the assumed intersecting road and it 'I will also be seenthat the edger plates |62 are likewise elevated since. they are carriedon the same bar (Fig. 4) which is secured toand takes the rearwardthrust of the cutter bar. In a like manner the operator operates thequicklift for the tamper assembly in the same manner as the quick-liftfor the cutter bar assembly.

When the intersecting road has been passed4 along the edge of the stripalready laid isa'emoved and the bracket |50 (Fig. 5) of the dollyissubstituted for this edger plate. This dolly has rollers which arearranged to ride on the edge of the strip already laid and-the elevationof the cutter bar assembly relative to those rollers' is adjusted (bythe holding bolts |53) so that the cutter bar assembly works into thesurface of the strip already laid and hence provides a seamless joint.It will be seen that by laying the first strip with extreme care thedolly shown in Fig. 5'

permits this strip to be used as a gage for the strip being laid againstthe rst strip, this dolly supporting the corresponding end of the cutterbar assembly. The operator thereupon adjusts the hand wheel |38 at theopposite side of the paver so as to provide the desired thickness ofpavement at that side and also adjusts the level indicator |58 so thatthe bubble of this indicator is in the center as long as this desiredlist of the paver is maintained. If the paver, in paving, departs fromthis desired list itwill immediately show in the bubble indicator |58and the operator can adjust the said vouter hand wheel |39 so as toelevate or depress theouter end of the cutter bar assembly up or down torestore the paver .to the desired position and the bubble in the paved,a. cutter bar holder carried by said carriage, a reciprocating cutterbar carried by said holder, means for depositing the paving material onthe surface to be paved in advance of said cutter bar, a bracket carriedby said carriage, means adjustably connecting said bracket and cutterbar holder and permitting of adjustably raising and lowering said cutterbar holder relative to said bracket and an independent quick lift meansconnecting said bracket with said carriage and comprising a crank armmounted on said carriage, means connecting the outer end of said crankarm with said bracket and means justably connecting said bracket andcutter bar f holder and permitting of adjustably raising and loweringsaid cutter bar holder relative to said bracket and quick lift meansconnecting said .bracket with said carriage and comprising arotatableshaft mounted on said carriage, Ya crank arm on said shaft, meansconnecting the outer end of said crank arm with said bracket, a ratchetwheel on said shaft and a lever, dog and detent means mounted on saidcarriage and co acting with said. ratchet wheel to rotate said crank armand quickly raise or lower said bracket thereby permitting of quicklyelevating and restoring said cutter bar without losing its adjust/ ment.

8. In a paver of the character described, a. carriage adapted totraverse the surface to be paved, an elongated cutterpbar holder carriedby said carriage, a reciprocating cutter bar carried by said holder andarranged longitudinally thereof, means for depositing the pavingmaterial on the surface to be paved in advance of said cutter bar,lifting means carried by said carriage and extending parallel with saidcutter bar holder to provide a quick lift mechanism for said cutter bar,independent means adjustably connecting each end of said cutter barholder with the corresponding end of said lifting means to permit ofindependently adjusting the elevation of said cutter bar holder relativeto said lifting means and means for actuating said lifting means tosimultaneously elevate both ends of said cutter bar holder.

9. In a paver of the character described, a carriage adapted to traversethe surface to be paved, an elongated cutter baroperatively connected tosaid carriage and extending transversely of the direction of movement ofsaid carriage,` and arranged to level paving material deposited on thesurface to be paved, means for supporting one end of said cutter b ar onthe surf-ace to be paved and means for supporting the other end of saidcutter bar on a prelaid surface parallel` to which the strip being laidis being deposited thereby to insure the formation of a smooth surfaceby said cutter bar gaged from said prelaid surface said last supportingmeans comprising a dolly having a supporting roller and removablyconnected with the corresponding end of said cutter bar.

10.,A In a paver of the character described, a carriage adapted totraverse the surface tov be paved, an elongated cutter bar operativelyconnected to said carriage and extending transversely of the directionof movementof said carriage and ar-v ranged to level paving material-deposited on the surface to be paved, means for supporting one end ofsaid cutter bar on the surface to be paved and means for supporting theother end of said.

cutter bar on a'prelaid surface parallel to. which the strip being laidis being deposited thereby to insure the formation of a smooth surfacegaged from said prelaid surface, said last supporting means comprising adolly having a supporting roller and removably connected with thecorresponding end of the cutterbar.

11.- In a paver of the character described, a carriage adapted totraverse the surface to be paved, means for depositing the pavingmaterial o n the surface to bepaved, a. cutter bar holder operativelyassociated with and carried valong with said carriage, an elongated,lengthwise reciprocating, cutter bar carried by said cutter bar holderand arranged to grade the deposited material,

= means moving with said carriage for supporting one end of said cutter.bar holderto follow, in general, the undulations of the lsurface to bepaved and means for supporting the other end of said cutter bar holderon a prelaid surface parallel, with which the strip being laid is beingde posited' thereby to insure the formation ofv a smooth surface by saidcutter bar gaged from said prelaid surface, said last supporting meanscomprising a dolly and means for attaching said dolly to thecorresponding end of said cutter bar holder.

12. In a paver o-f the character described, a carriage adapted totraverse the surface to .be paved,

an elongated cutter bar operatively connected to said carriage andextending transversely of the direction of movement ofsaid carriage andarranged to level the paving materialdeposited on thesurface to bepaved, means for reciprocating said cutter bar transversely of the lineof movement of said carriage, means on said carriage for adjusting thelelevation of said cutter bar relative to the surface to be paved, aninternal combustion engine for propelling said carriage and means forinternally heating said cutter bar.

13. In a paver of the character described, a carriage adapted totraverse the surface to be paved, an elongated cutter bar operativelyconnected to said carriage and extending transversely of the directionof movement of said carriage and arranged to level the paving materialdeposited on the surface to be paved, an internal combustion engine forpropelling said carriage, means for internally heating said cutter barthrough heat derived from the combustion of the fuel in said engine andmeans for reciprocating said cutter bar through power derived from saidengine.

14. In a paver of the character described, a car.-v

riage adapted to traverse the surface to be paved, an elongated cutterbar operatively connected with said carriage and extending 'transverselyof the direction of movement ofsaid carriage, means for reciprocatingsaid cutter bar, said cutter bar comprising an upper elongated plate,side spacer bars depending from the longitudinal edges of said plate,sections secured across the bottoms of said spacer bars and projectingforwardly to form teeth which level the paving material deposited on thesurface to be paved and means in the space between said upper plate,spacer bars and sections for heatingsaid cutter bar.

15. In a paver of the character described, a car-

